Whoever walks with the wise becomes wise, but the companion of fools will suffer harm.  –Proverbs 13:20 (ESV)

A man of many companions may come to ruin, but there is a friend who sticks closer than a brother.  –Proverbs 18:24 (ESV)

Do not be deceived: “Bad company ruins good morals.”  –1 Corinthians 15:33 (ESV)

–Adam Clarke, Christian Theology, pp. 474-475